Links to Sites Relating to Noteworthy, sire of Nefarious.
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Stallion-Sire to Nefarious and isroldenburg.org/

Historically, long before we knew anything of the science of genetics and DNA,
breeders (especially of horses and dogs) noted that certain pairs produced
exceptional offspring. If they were able to get multiple breeding,
they had repeatedly exceptional animals. In literature, you will find that they
called this a “Nick”. Here are some web sites for further reading.
(Note: they open in a new window or a new tab.)